As Openstack projects continue to have longer database migration
chains, the Puppet default timeout of 300 seconds for an execution
is becoming too short a duration on some hardware, leading to timeouts.
As projects continue to add more migration scripts without pruning
the base, timeouts will continue to become more frequent unless
this time can be expanded.
Change-Id: Icd6698d7b15344b7ab1c14aad08ebc1cd61346f6
Closes-Bug: #1904962
83f9db704c